Hello!As a user (not a developer) of GNS3 I ask you to include the patch for UDP. VirtualBox has included it, so it's time for QEMU now.
There was discussion about it (p.ex http://lists.gnu.org/archive/html/qemu-devel/2011-11/msg00787.html )
I wish I had it finally for Qemu 1.0. It makes possible for an average user to use full-featured and well-rounded GNS3.
Regards!